How can i use the PID controller function

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I am trying to use the PID controller in matlab but when i do, i get the message "undefined function or variable". Is there some download that i can install or if someone could give me a solution I'd appreciate it, got some assignments i need to complete.
Thanks in advance
  2 Comments
William
William on 17 Jun 2013
I was trying to following an example i found on this website:
Kp = 1; Ki = 1; Kd = 1;
s = tf('s');
C = Kp + Ki/s + Kd*s
C =
s^2 + s + 1
-----------
s
C = pid(Kp,Ki,Kd)
tf(C)
ans =
s^2 + s + 1
-----------
thats when i get the message undefines function or variable "pid"

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Accepted Answer

Arkadiy Turevskiy
Arkadiy Turevskiy on 27 Jun 2013
pid objects and PID Tool were added to Control System Toolbox in release 2010b. Upgrade to that release or later to be able to use pid objects.
You can still do what the example describes, you will just have to represent PID controllers as transfer functions, as discussed at the top of the example.

More Answers (2)

David Sanchez
David Sanchez on 17 Jun 2013
As an example, you could take a look at the following link:

bassem adel
bassem adel on 9 Feb 2016
how can I use the pid function in MATLAB R2007b ?

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